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4 results on '"Marcel Mudrich"'

1. Desorption dynamics of RbHe exciplexes off He nanodroplets induced by spin-relaxation

Author

Frank Stienkemeier, Martí Pi, Marcel Mudrich, François Coppens, Johannes von Vangerow, Nadine Halberstadt, Manuel Barranco, Théorie (LCAR), Laboratoire Collisions Agrégats Réactivité (LCAR), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona (UB), Facultat de Física, Department of Physics and Astronomy [Aarhus], Aarhus University [Aarhus], Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Materials science, Doping, Degrees of freedom (physics and chemistry), General Physics and Astronomy, 010402 general chemistry, Excimer, 01 natural sciences, 0104 chemical sciences, 3. Good health, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Chemical physics, Desorption, 0103 physical sciences, Atom, Physics::Atomic and Molecular Clusters, Molecule, Physical and Theoretical Chemistry, 010306 general physics, Spin (physics), Excitation, ComputingMilieux_MISCELLANEOUS
Abstract

Doped He nanodroplets are ideal model systems to study the dynamics of elementary photophysical processes in heterogeneous nanosystems. Here we present a combined experimental and theoretical investigation of the formation of free RbHe exciplex molecules from laser-excited Rb-doped He nanodroplets. Upon excitation of a droplet-bound Rb atom to the 5p3/22Π3/2-state, a stable RbHe exciplex forms within about 20 ps. Only due to 2Π3/2 → 2Π1/2 spin-relaxation does the RbHe exciplex detach from the He droplet surface with a half life of about 700 ps, given by the spin-relaxation time and the coupling of spin and translational degrees of freedom.

Published
2018

2. Imaging Excited-State Dynamics of Doped He Nanodroplets in Real-Time

Author

Manuel Barranco, Martí Pi, Johannes von Vangerow, Frank Stienkemeier, Nadine Halberstadt, Antonio Leal, Marcel Mudrich, François Coppens, Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Théorie (LCAR), Laboratoire Collisions Agrégats Réactivité (LCAR), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Departament ECM, Facultat de Física, Universitat de Barcelona (ECM), Universitat de Barcelona (UB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)

Subjects
010304 chemical physics, Chemistry, Solvation, 010402 general chemistry, 01 natural sciences, Dissociation (chemistry), 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Ionization, Desorption, Excited state, 0103 physical sciences, Atom, Femtosecond, Physics::Atomic and Molecular Clusters, General Materials Science, Density functional theory, Physics::Atomic Physics, Physical and Theoretical Chemistry, Atomic physics
Abstract

International audience; The real-time dynamics of excited alkali metal atoms (Rb) attached to quantum fluid He nanodroplets is investigated using femtosecond imaging spectroscopy and time-dependent density functional theory. We disentangle the competing dynamics of desorption of excited Rb atoms off the He droplet surface and solvation inside the droplet interior as the Rb atom is ionized. For Rb excited to the 5p and 6p states, desorption occurs on starkly differing time scales (∼100 versus ∼1 ps, respectively). The comparison between theory and experiment indicates that desorption proceeds either impulsively (6p) or in a transition regime between impulsive dissociation and complex desorption (5p).

Published
2017

3. Atom-molecule collisions in an optically trapped gas

Author

Marcel Mudrich, Daniel Comparat, Nassim Zahzam, Thibault Vogt, Pierre Pillet, Laboratoire Aimé Cotton (LAC), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Atomic Physics (physics.atom-ph), Inelastic collision, General Physics and Astronomy, chemistry.chemical_element, FOS: Physical sciences, PACS 32.80.Pj, 33.20.-t, 33.55.Be, 33.80.Ps, 34.20.-b, 42.50.Vk, 02 engineering and technology, Trapping, trapping, 01 natural sciences, Physics - Atomic Physics, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Magnetic trap, 0103 physical sciences, Atom, Molecule, Physics::Atomic Physics, 010306 general physics, Physics, Condensed Matter::Quantum Gases, cold moelcules, cold collision, Quantum Physics, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], Rotational–vibrational spectroscopy, cold atoms, 021001 nanoscience & nanotechnology, Dipole, chemistry, Caesium, Atomic physics, 0210 nano-technology, Quantum Physics (quant-ph)
Abstract

Cold inelastic collisions between confined cesium (Cs) atoms and Cs$\_2$ molecules are investigated inside a CO$\_2$ laser dipole trap. Inelastic atom-molecule collisions can be observed and measured with a rate coefficient of $\sim 2.5 \times 10^{-11} $cm$^3$ s$^{-1}$, mainly independent of the molecular ro-vibrational state populated. Lifetimes of purely atomic and molecular samples are essentially limited by rest gas collisions. The pure molecular trap lifetime ranges 0,3-1 s, four times smaller than the atomic one, as is also observed in a pure magnetic trap. We give an estimation of the inelastic molecule-molecule collision rate to be $\sim 10^{-11}$ cm$^{3}$ s$^{-1}$.

Published
2005

4. Star clusters dynamics in a laboratory: electrons in an ultracold plasma

Author

Pierre Pillet, Thibault Vogt, Marcel Mudrich, Daniel Comparat, Nassim Zahzam, Laboratoire Aimé Cotton (LAC), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Atomic Physics (physics.atom-ph), atomic processes, ultracold plasma, FOS: Physical sciences, Electron, Astrophysics, 7. Clean energy, 01 natural sciences, Virial theorem, Physics - Atomic Physics, 010305 fluids & plasmas, Ion, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Condensed Matter - Strongly Correlated Electrons, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, Binary star, Physics::Atomic Physics, 010306 general physics, Physics, Quantum Physics, Strongly Correlated Electrons (cond-mat.str-el), [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], Astrophysics (astro-ph), Astronomy and Astrophysics, Plasma, plasmas, Physics - Plasma Physics, Plasma Physics (physics.plasm-ph), Stars, Star cluster, Space and Planetary Science, Rydberg atom, stellar dynamics, Atomic physics, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], Quantum Physics (quant-ph), Rydberg atoms
Abstract

Electrons in a spherical ultracold quasineutral plasma at temperature in the Kelvin range can be created by laser excitation of an ultra-cold laser cooled atomic cloud. The dynamical behavior of the electrons is similar to the one described by conventional models of stars clusters dynamics. The single mass component, the spherical symmetry and no stars evolution are here accurate assumptions. The analog of binary stars formations in the cluster case is three-body recombination in Rydberg atoms in the plasma case with the same Heggie's law: soft binaries get softer and hard binaries get harder. We demonstrate that the evolution of such an ultracold plasma is dominated by Fokker-Planck kinetics equations formally identical to the ones controlling the evolution of a stars cluster. The Virial theorem leads to a link between the plasma temperature and the ions and electrons numbers. The Fokker-Planck equation is approximate using gaseous and fluid models. We found that the electrons are in a Kramers-Michie-King's type quasi-equilibrium distribution as stars in clusters. Knowing the electron distribution and using forced fast electron extraction we are able to determine the plasma temperature knowing the trapping potential depth., Comment: Submitted to MNRAS

Published
2005

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